# atomic_flag

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< c‎ | atomic

Defined in header ``<stdatomic.h>`` |  |
typedef struct /* unspecified */ atomic_flag; |  | (since C11)

`atomic_flag` is an atomic boolean type. Unlike other atomic types, it is guaranteed to be lock-free. Unlike `atomic_bool`, `atomic_flag` does not provide load or store operations.

### References

- C23 standard (ISO/IEC 9899:2024):

  - 7.17.1/5 atomic_flag (p: 293)

  - 7.17.8 Atomic flag type and operations (p: 302-303)

- C17 standard (ISO/IEC 9899:2018):

  - 7.17.1/4 atomic_flag (p: 200)

  - 7.17.8 Atomic flag type and operations (p: 208-209)

- C11 standard (ISO/IEC 9899:2011):

  - 7.17.1/4 atomic_flag (p: 273)

  - 7.17.8 Atomic flag type and operations (p: 285-286)

### See also

ATOMIC_FLAG_INIT (C11) | initializes a new atomic_flag (macro constant)
atomic_flag_test_and_setatomic_flag_test_and_set_explicit (C11) | sets an atomic_flag to true and returns the old value (function)
atomic_flag_clearatomic_flag_clear_explicit (C11) | sets an atomic_flag to false (function)
C++ documentation for atomic_flag

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